CVE-2022-49932
KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace
In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace Call kvm_init() only after _all_ setup is complete, as kvm_init() exposes /dev/kvm to userspace and thus allows userspace to create VMs (and call other ioctls). E.g. KVM will encounter a NULL pointer when attempting to add a vCPU to the per-CPU loaded_vmcss_on_cpu list if userspace is able to create a VM before vmx_init() configures said list. BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP CPU: 6 PID: 1143 Comm: stable Not tainted 6.0.0-rc7+ #988 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:vmx_vcpu_load_vmcs+0x68/0x230 [kvm_intel] <TASK> vmx_vcpu_load+0x16/0x60 [kvm_intel] kvm_arch_vcpu_load+0x32/0x1f0 [kvm] vcpu_load+0x2f/0x40 [kvm] kvm_arch_vcpu_create+0x231/0x310 [kvm] kvm_vm_ioctl+0x79f/0xe10 [kvm] ? handle_mm_fault+0xb1/0x220 __x64_sys_ioctl+0x80/0xb0 do_syscall_64+0x2b/0x50 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f5a6b05743b </TASK> Modules linked in: vhost_net vhost vhost_iotlb tap kvm_intel(+) kvm irqbypass
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ dbef2808af6c594922fe32833b30f55f35e9da6d; < e136e969d268b9b89329c816c002e53f60e82985 (affected, git) ≥ dbef2808af6c594922fe32833b30f55f35e9da6d; < e28533c08023c4b319b7f2cd77f3f7c9204eb517 (affected, git) ≥ dbef2808af6c594922fe32833b30f55f35e9da6d; < e32b120071ea114efc0b4ddd439547750b85f618 (affected, git) b2f7d0adc1260fa33ff3e992d18ff15873e68a67 (affected, git) 2c0bf2560ca18abe1451db23b8ef8700c67cc44f (affected, git) f9971a898a815c2a6cce2932e91a576b28ed4cce (affected, git) 40888c31aca3a46f266f1f121679f8e1982df085 (affected, git) cd3f438fbb9cb60da32dd2b665f7dc9baba1c4ad (affected, git) e35a2dc8c7f664ae8a9cc46d19985dc79bfc1083 (affected, git) ≥ 4.9.220; < 4.10 (affected, semver) ≥ 4.14.177; < 4.15 (affected, semver) ≥ 4.19.116; < 4.20 (affected, semver) ≥ 5.4.33; < 5.5 (affected, semver) ≥ 5.5.18; < 5.6 (affected, semver) ≥ 5.6.5; < 5.7 (affected, semver) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
5.7 (affected) ≥ 0; < 5.7 (unaffected, semver) ≥ 6.1.20; ≤ 6.1.* (unaffected, semver) ≥ 6.2.7; ≤ 6.2.* (unaffected, semver) ≥ 6.3; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
For agents and automation
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